mysql基本操作

use 数据库名

  • 设置连接服务器及当前客户端的字符集

    mysql> set names utf8;
    Query OK, 0 rows affected (0.00 sec)

  • 查看当前服务支持的字符集

    mysql> show charset;
    +———-+—————————–+———————+——–+
    | Charset | Description | Default collation | Maxlen |
    +———-+—————————–+———————+——–+
    | big5 | Big5 Traditional Chinese | big5_chinese_ci | 2 |
    | dec8 | DEC West European | dec8_swedish_ci | 1 |
    | cp850 | DOS West European | cp850_general_ci | 1 |
    | hp8 | HP West European | hp8_english_ci | 1 |
    | koi8r | KOI8-R Relcom Russian | koi8r_general_ci | 1 |
    | latin1 | cp1252 West European | latin1_swedish_ci | 1 |
    | latin2 | ISO 8859-2 Central European | latin2_general_ci | 1 |
    | swe7 | 7bit Swedish | swe7_swedish_ci | 1 |
    | ascii | US ASCII | ascii_general_ci | 1 |
    | ujis | EUC-JP Japanese | ujis_japanese_ci | 3 |
    | sjis | Shift-JIS Japanese | sjis_japanese_ci | 2 |
    | hebrew | ISO 8859-8 Hebrew | hebrew_general_ci | 1 |
    | tis620 | TIS620 Thai | tis620_thai_ci | 1 |
    | euckr | EUC-KR Korean | euckr_korean_ci | 2 |
    | koi8u | KOI8-U Ukrainian | koi8u_general_ci | 1 |
    | gb2312 | GB2312 Simplified Chinese | gb2312_chinese_ci | 2 |
    | greek | ISO 8859-7 Greek | greek_general_ci | 1 |
    | cp1250 | Windows Central European | cp1250_general_ci | 1 |
    | gbk | GBK Simplified Chinese | gbk_chinese_ci | 2 |
    | latin5 | ISO 8859-9 Turkish | latin5_turkish_ci | 1 |
    | armscii8 | ARMSCII-8 Armenian | armscii8_general_ci | 1 |
    | utf8 | UTF-8 Unicode | utf8_general_ci | 3 |
    | ucs2 | UCS-2 Unicode | ucs2_general_ci | 2 |
    | cp866 | DOS Russian | cp866_general_ci | 1 |
    | keybcs2 | DOS Kamenicky Czech-Slovak | keybcs2_general_ci | 1 |
    | macce | Mac Central European | macce_general_ci | 1 |
    | macroman | Mac West European | macroman_general_ci | 1 |
    | cp852 | DOS Central European | cp852_general_ci | 1 |
    | latin7 | ISO 8859-13 Baltic | latin7_general_ci | 1 |
    | utf8mb4 | UTF-8 Unicode | utf8mb4_general_ci | 4 |
    | cp1251 | Windows Cyrillic | cp1251_general_ci | 1 |
    | utf16 | UTF-16 Unicode | utf16_general_ci | 4 |
    | utf16le | UTF-16LE Unicode | utf16le_general_ci | 4 |
    | cp1256 | Windows Arabic | cp1256_general_ci | 1 |
    | cp1257 | Windows Baltic | cp1257_general_ci | 1 |
    | utf32 | UTF-32 Unicode | utf32_general_ci | 4 |
    | binary | Binary pseudo charset | binary | 1 |
    | geostd8 | GEOSTD8 Georgian | geostd8_general_ci | 1 |
    | cp932 | SJIS for Windows Japanese | cp932_japanese_ci | 2 |
    | eucjpms | UJIS for Windows Japanese | eucjpms_japanese_ci | 3 |
    +———-+—————————–+———————+——–+
    40 rows in set (0.02 sec)

  • 查看数据库引擎

    mysql> show engines;
    +——————–+———+————————————————
    —————-+————–+——+————+
    | Engine | Support | Comment

                | Transactions | XA   | Savepoints |
    

    +——————–+———+————————————————
    —————-+————–+——+————+
    | FEDERATED | NO | Federated MySQL storage engine

                | NULL         | NULL | NULL       |
    

    | MRG_MYISAM | YES | Collection of identical MyISAM tables

                | NO           | NO   | NO         |
    

    | MyISAM | YES | MyISAM storage engine

                | NO           | NO   | NO         |
    

    | BLACKHOLE | YES | /dev/null storage engine (anything you write to
    it disappears) | NO | NO | NO |
    | CSV | YES | CSV storage engine

                | NO           | NO   | NO         |
    

    | MEMORY | YES | Hash based, stored in memory, useful for tempor
    ary tables | NO | NO | NO |
    | ARCHIVE | YES | Archive storage engine

                | NO           | NO   | NO         |
    

    | InnoDB | DEFAULT | Supports transactions, row-level locking, and f
    oreign keys | YES | YES | YES |
    | PERFORMANCE_SCHEMA | YES | Performance Schema

                | NO           | NO   | NO         |
    

    +——————–+———+————————————————
    —————-+————–+——+————+
    9 rows in set (0.01 sec)

  • 修改数据库的字符集

    mysql> alter database db character set utf8;
    Query OK, 1 row affected (0.00 sec)

   

一、基本操作

mysql> use test
Database changed
mysql> select database();
+------------+
| database() |
+------------+
| test       |
+------------+
1 row in set (0.00 sec)
  • 切换一个数据库为当前数据库

drop database 数据库名

  • 查看字符集

    mysql> show variables like ‘char%’;
    +————————–+————————–+
    | Variable_name | Value |
    +————————–+————————–+
    | character_set_client | gbk |
    | character_set_connection | gbk |
    | character_set_database | latin1 |
    | character_set_filesystem | binary |
    | character_set_results | gbk |
    | character_set_server | latin1 |
    | character_set_system | utf8 |
    | character_sets_dir | c:mysqlsharecharsets |
    +————————–+————————–+
    8 rows in set (0.00 sec)

连接Mysql后,结束一条sql语句要在后面加一个分号”;“。

  • 创建数据库

    #在创建数据时,可以在数据库名前后加一个反引号(TAB键上的一个键),这样就可以用关键字创建一个数据库了,否则报错。
    mysql> create database customer;
    Query OK, 1 row affected (0.00 sec)

  • 查看mysql版本

    mysql> select version();
    +———–+
    | version() |
    +———–+
    | 5.6.38 |
    +———–+
    1 row in set (0.00 sec)

  • 查看当前数据库

    mysql> select database();
    +————+
    | database() |
    +————+
    | NULL |
    +————+
    1 row in set (0.00 sec)

  • 查看当前的登录用户名

    mysql> select user();
    +—————-+
    | user() |
    +—————-+
    | root@localhost |
    +—————-+
    1 row in set (0.00 sec)

  • 查看当前的登录用户名

    mysql> select current_user();
    +—————-+
    | current_user() |
    +—————-+
    | root@localhost |
    +—————-+
    1 row in set (0.00 sec)

  • 查看当前日期时间

    mysql> select curtime(),curdate(),now();
    +———–+————+———————+
    | curtime() | curdate() | now() |
    +———–+————+———————+
    | 15:43:50 | 2018-01-15 | 2018-01-15 15:43:50 |
    +———–+————+———————+
    1 row in set (0.00 sec)

  • 查看有多少数据库

    mysql> show databases;
    +——————–+
    | Database |
    +——————–+
    | information_schema |
    | mysql |
    | performance_schema |
    | test |
    +——————–+
    4 rows in set (0.01 sec)

  • 删除一个指定的数据库

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